Perhaps you should try some spelling variations:
"5 nn decrease" » "k nn decrease" (Expand Search), "5 nn decreased" (Expand Search), "5 nn increase" (Expand Search)
"_ nn decrease" » "_ non decrease" (Expand Search), "_ n decrease" (Expand Search), "_ na decrease" (Expand Search), "_ nn decreased" (Expand Search), "_ nn increase" (Expand Search)
"50 ms decrease" » "50 ms decreased" (Expand Search), "50 ms increase" (Expand Search)
"50 a decrease" » "50 a decreased" (Expand Search), "50 a increase" (Expand Search)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("50 ms decrease") OR ((("50 a decrease") OR ((("5 nn decrease") OR ("_ nn decrease"))))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"50 ms decrease\") OR (((\"50 a decrease\") OR (((\"5 nn decrease\") OR (\"_ nn decrease\"))))))".
• Removing quotes may allow a broader search: (( 50 ms decrease ) OR ((( 50 a decrease ) OR ((( 5 nn decrease ) OR ( _ nn decrease )))))).
• Adding a wildcard symbol may retrieve word variants: (("50 ms decrease") OR ((("50 a decrease") OR ((("5 nn decrease") OR ("_ nn decrease"))))))*.